Google Maps (API v2) help

Default zoom level
When the Google Map is loaded the first time, the Map is displayed using a default zoom level.

Zoom level 0 means show me the whole world.
Zoom level 20 means show me the most detailed map of the specified coordinate.

The highest zoom levels are usually not available.

If you want to display the most detailed map, always start with the lowest zoom level and increase the zoom level.